Musselshell County, Montana
Musselshell County, Montana, has 5,582 residents (July 2025 estimate). Its county seat is Roundup. It uses Mountain Time and covers 1,869 sq mi (4,841 km²) of land.
- Resident population, July 2025
- 5,582
- Land area
- 1,869 sq mi (4,841 km²)
- County seat or government
- Roundup
- Time zone
- Mountain TimeUTC-07:00 in January; UTC-06:00 in July
- Median household income
- $58,920 ± $9,325
- Median home value
- $235,000 ± $20,782
- Median rent, with utilities
- $1,138 ± $614
- Homes lived in by their owners
- 85.1% ± 4.2 points
- County type
- County
- Metro or micro area
- Outside any metro or micro areaNext to: Billings, MT metro area
- Water area
- 2.75 sq mi (7.12 km²)
- State
- Montana
- County code (FIPS)
- 30065
- Coordinates (central point)
- 46.505281, -108.439763
These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.
Time zones in Musselshell County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| Mountain TimeAmerica/Denver | UTC-07:00 in January; UTC-06:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.
ZIP Code areas, largest first
5 ZIP Code areas overlap Musselshell County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.
Official county information
We don’t have a website for this county yet. The US government’s local-office directory ↗ lists its offices. A geographic lookup cannot determine eligibility, tax liability or a court obligation.
School districts in Musselshell County, largest first
- Roundup High School District4,860 people
- Roundup Elementary School District4,701 people
- Broadview High School District986 people
- Broadview Elementary School District927 people
- Melstone Elementary School District402 people
- Melstone High School District225 people
Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.
Cities, towns and communities, largest first
These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.
- Roundup, Montana (city)2,003 people
- Klein, Montana (CDP)340 people
- Camp Three, Montana (CDP)139 people
- Melstone, Montana (town)80 people
- Musselshell, Montana (CDP)36 people
- Kilby Butte Colony, Montana (CDP)20 people
- Flat Willow Colony, Montana (CDP)0 people
Bordering areas, nearest first
Distances are straight lines between map points.
- Golden Valley County, Montana36 mi west
- Yellowstone County, Montana40 mi south
- Petroleum County, Montana45 mi north
- Fergus County, Montana62 mi northwest
- Rosebud County, Montana88 mi east
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